<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>实验2_4</title>
		<style>
			.c1{
				width:200px;
				height: 100px;
				background-color: cyan;
			}
			</style>
	</head>
	<body>
		<div class="c1">1</div>
		<div class="c1">2</div>
		<span class="c1">3</span>
		<span class="c1">2</span>
	</body>
</html>